// Deposit.java
// Represents a deposit ATM transaction

public class Deposit extends Transaction {
	private double amount; // amount to deposit
	private Keypad keypad; // reference to keypad
	private final static int CANCELED = 0; // constant for cancel option

	// Deposit constructor
	public Deposit(String userAccountNumber, Screen atmScreen,
			BankDatabase atmBankDatabase, Keypad atmKeypad) {
		// initialize superclass variables
		super(userAccountNumber, atmScreen, atmBankDatabase);

		// initialize references to keypad and deposit slot
		keypad = atmKeypad;
	} // end Deposit constructor

	// perform transaction
	@Override
	public void execute() {
		BankDatabase bankDatabase = getBankDatabase(); // get reference
		Screen screen = getScreen(); // get reference

		amount = promptForDepositAmount(); // get deposit amount from user

		// check whether user entered a deposit amount or canceled
		if (amount != CANCELED) {
			// request deposit envelope containing specified amount
			screen.displayMessage("\nPlease insert a deposit envelope containing ");
			screen.displayDollarAmount(amount);
			screen.displayMessageLine(".");

			bankDatabase.credit(getAccountNumber(), amount);

		} // end if
		else // user canceled instead of entering amount
		{
			screen.displayMessageLine("\nCanceling transaction...");
		} // end else
	} // end method execute

	// prompt user to enter a deposit amount in cents
	private double promptForDepositAmount() {
		Screen screen = getScreen(); // get reference to screen

		// display the prompt
		screen.displayMessage("\nPlease enter a deposit amount in "
				+ "CENTS (or 0 to cancel): ");
		int input = keypad.getInt(); // receive input of deposit amount

		// check whether the user canceled or entered a valid amount
		if (input == CANCELED)
			return CANCELED;
		else {
			return (double) input / 100; // return dollar amount
		} // end else
	} // end method promptForDepositAmount
} // end class Deposit

/**************************************************************************
 * (C) Copyright 1992-2010 by Deitel & Associates, Inc. and * Pearson Education,
 * Inc. All Rights Reserved. * * DISCLAIMER: The authors and publisher of this
 * book have used their * best efforts in preparing the book. These efforts
 * include the * development, research, and testing of the theories and programs
 * * to determine their effectiveness. The authors and publisher make * no
 * warranty of any kind, expressed or implied, with regard to these * programs
 * or to the documentation contained in these books. The authors * and publisher
 * shall not be liable in any event for incidental or * consequential damages in
 * connection with, or arising out of, the * furnishing, performance, or use of
 * these programs. *
 *************************************************************************/
